Improvement in sand-screens



A v M-feZ/ @einen tetes meut @ffice ROBERT MCMU'BBAY, OF BROOKLYN, NEWYORK.'

Letters Patent No. 77,509, dated May 5, 1868.

i IMPROVEMENT IN SAND-SCREENS.

T0 ALL WHOM IT MAY CONCERN:

Be it known that I, ROBERT McMURRAY, of Brooklyn, of Kings county, inthe Statc'of New York, have invented certain new and useful Improvementsin Smid-Screens; and I do hereby declare that the following is a fulland exact description thereof, reference being had to the accompanyingdrawings, making part of this application.

My invention relatesto a. new and useful improvement in sand-screens,and has for its objects the production of a simple, durable, andeffective apparatus. I v

Previous to my invention, one ofthe great diicnlties in the practicaluse of screens, such as used general] by builders or masons to screensand,has been the liability of the vertical wires to become displacedand inoperative, rendering the screen ineffective. Some devices or meanshave been suggested to prevent the slipping laterally and the sagging ofthe vertical wires, and one or more patents have been granted for suchdevices; but, so far as I am aware, they are either not whollyeffective, or are too costly to come into general use.

My invention consists in the use of cross-wire, formed with a series ofeyes equidistant, through which the vertical rods or wires are passed,and by which said vertical reds or wires are all retained securely inperfect adjustment, equidistant, and in parallel lines, as will be'presently more fully explained. l

Toenable those skilled iu the art to make and use myinvention, I willproceed to describe the construction and operation of one of my improvedscreens, referring by letters to the accompanying drawings, in whiehFigure 1 is a front elevation, and

Figure 2 a. cross-section (at a: x, iig. 1) et' one of my screens.

A. is the frame or body, made of wood generally, in vthe usual form. bb,Sie., are the 'vertical wires or rods, v

which are arranged equidistant, as shown, are secured at their ends inthe upper and lower portiensoi' the frame A, and pass through and areretained laterally in position by the cross-wires c e, 82e. .Thesecross-wires c c are formed with series of eyes or loops, as clearlyshown, which are of the proper size and shape to accommodate thevertical rodsb b, .which pass through t-hem.

I have shown three of these-crcss-wires, but a greater or less numbermay be used, as deemed expedient.

These Wires c c may be made by inachinery, in given lengths, andafterward cut up to suit the size of screen to be manufactured, and beput and fastened in the frame A in any desirable manner.

fff are cross-bars, put into the frame, and arranged immediately behindthe vertical bars b, and close to the eyed wires c, and they serve toback or stiften the wire-work. Ihey may be made removable if deemedexpedient. l

It will be seen that by forming the wire-work of a screen in the vmannerdescribed, with eyed cross-bars c7 made with equidista-nt loops, andvertical rods or wires passed thro-ugh them, the vertical bars I1 arereadily placed in parallel equidistant lines, and are kept in perfectadjustment, while` at the same time, the whole fabric is simple, light,economic of construction, and durable.

vWhere it may be deemed advisable, or the slenderncss of the verticalrods require it, additional cross-bars fmay be employed, to giveadditional rigidity to the screen, and prevent the bending of the rodsb.

It will also be observed that, by making the sc reen ot'v eyedcross-wires c, with the vertical rods passing through them, there is butlittle space obstructed, and the whole effective screening-surface isincreased over j that obtained by the usual mode of manufacturing, inwhich other devices are employed to hold apart the vertical rods.

If desired, the cross-wires may be arranged with nuts on their ends, sothat they may belstrained or tightened up, as circumstances require.

Having explained my invention, so that one skilled in the art can makeand use it, what I claim as new, and desire to secure by Letters Patent,is- A The combination, with the frame and straight vertical rods, ofcross-wires, formed with cquidistant eyes or loops, through which thevertical rods pass, and by which they are retained laterally, allsubstantially as and for the purposes described.

In testimony whereof, I have hereunto set my hand and seal, this ninthday of December, 1867.

' ROBERT McMURRAY. [L 5.]

Witnesses: C. A. Soorr, ANDREW Dn Laer.

